Mechanical and chemical plaque control in the simultaneous management of gingivitis and caries: a systematic review

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1 J Clin Periodontol 2017; 44 (Suppl. 18): S116 S134 doi: /jcpe Mechanical and chemical plaque control in the simultaneous management of gingivitis and caries: a systematic review Figuero E, Nobrega DF, Garcıa-Gargallo M, Tenuta LMA, Herrera D, Carvalho JC. Mechanical and chemical plaque control in the simultaneous management of gingivitis and caries: a systematic review. J Clin Periodontol 2017; 44 (Suppl. 18): S116 S134. doi: /jcpe Abstract Aim: To report the evidence on the effect of mechanical and/or chemical plaque control in the simultaneous management of gingivitis and caries. Material and Methods: A protocol was designed to identify randomized (RCTs) and controlled (CCTs) clinical trials, cohort studies and prospective case series (PCS), with at least 6 months of follow-up, reporting on plaque, gingivitis and caries. Relevant information was extracted from full papers, including quality and risk of bias. Meta-analyses were performed whenever possible. Results: After the screening of 1,373 titles, 15 RCTs, 10 CCTs and 2 PCS were included. Low to moderate evidence support that combined professional and selfperformed mechanical plaque control significantly reduces standardized plaque index [n = 4; weighted mean difference (WMD) = 1.294; 95% CI (0.445; 2.144); p = 0.003] and gingivitis scores [n = 4; WMD = 1.728; 95% CI (0.631; 2.825); p = 0.002]. The addition of fluoride to mechanical plaque control is relevant for caries management [n = 5; WMD = 1.159; 95% CI (0.145; 2.172); p = 0.025] while chlorhexidine rinses are relevant for gingivitis. Conclusion: Mechanical plaque control procedures are effective in reducing plaque and gingivitis. The addition of fluoride to mechanical plaque control is significant for caries management. Chlorhexidine rinse has a positive effect on gingivitis and inconclusive role in caries. Elena Figuero 1, Diego F. Nobrega 2, Marıa Garcıa-Gargallo 1, Livia M. A. Tenuta 2, David Herrera 1 and Joana C. Carvalho 3 1 ETEP (Etiology and Therapy of Periodontal Diseases) Research Group, University Complutense, Madrid, Spain; 2 Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, Brazil; 3 Faculty of Medicine and Dentistry, Catholic University of Louvain, Brussels, Belgium Key words: caries; mechanical plaque control; DMF; gingival index; gingivitis; chemical plaque control; meta-analyses; plaque index; systematic review Accepted for publication 13 December 2016 Conflict of interest and source of funding statement The authors have stated explicitly that there are no conflict of interest in connection with this article. This work was self-funded by the ETEP (Etiology and Therapy of Periodontal Diseases) Research Group, University Complutense, Madrid, Spain, and by the Catholic University of Louvain (UCL), Faculty of Medicine and Dentistry, Brussels, Belgium and by the University of Campinas (UNICAMP), Piracicaba Dental School, Piracicaba, Brazil. S116 Periodontal diseases (gingivitis and periodontitis) are considered inflammatory diseases of microbiological origin. Their most important risk factor is the accumulation of a plaque biofilm at and below the gingival margin, which is then associated with an inappropriate and destructive host inflammatory immune response (Chapple et al. 2015). Dental caries is an ubiquitous process defined as the result of a localized chemical dissolution of the tooth surface caused by acid production by the dental biofilm exposed frequently to sugars (Fejerskov et al. 2015). Following these concepts, it may be stated that the dental biofilm is a biological determinant associated with the development of both periodontal diseases and dental caries. Although not all patients with gingivitis will develop periodontitis, the management of gingivitis is considered both a primary prevention strategy for periodontitis and secondary for recurrent periodontitis

2 Plaque control in gingivitis and caries S117 (Chapple et al. 2015). Similarly, dental caries may be managed in such way that caries lesions at clinical and/or radiographic levels never form (Carvalho 2014). Inactivation of active non-cavitated lesions is the most important strategy to inhibit further caries progression (Thylstrup 1998, Nyvad et al. 2003, Carvalho & Mestrinho 2014). To some extent, this concept also applies to cavitated lesions provided that regular disorganization of the dental biofilm is possible. Fluoride has a key role in this management, reducing the rate of tooth mineral loss (Fejerskov et al. 1981, Tenuta & Cury 2010). Recent evidence, coming from systematic reviews, supports the efficacy of mechanical (Needleman et al. 2015, Salzer et al. 2015, Van der Weijden & Slot 2015) and chemical plaque control (Serrano et al. 2015) in the reduction of plaque levels. Therefore, it seems reasonable that both procedures might have a simultaneous impact on gingivitis and caries, as there is independent evidence that both methods are effective in controlling gingivitis (Chapple et al. 2015, Tonetti et al. 2015) and professional and self-performed mechanical plaque control in combination with fluorides reduces coronal caries increment in children and adolescents (Marinho et al. 2003, Axelsson et al. 2004) as well as inactivate root caries lesions in elderly (Nyvad & Fejerskov 1986, Ekstrand et al. 2013). Therefore, the main objective of this systematic review was to answer the PICO question: In systemically healthy patients, which is the effect of mechanical and/or chemical plaque control methods on plaque/gingivitis reduction and on caries increment? Material and methods A protocol was developed in advance considering the following specific items: Population: Systemically healthy patients. Intervention: (i) mechanical plaque control procedures with or without the additional use of fluoride and/or (ii) chemical plaque control formulations adjunctive to oral hygiene procedures with or without prophylaxis. Comparison: Any mechanical or chemical plaque control regime (positive control) or placebo (negative control) or no control regime. Outcome: The primary main common outcome of the study was plaque reduction, followed by gingivitis or bleeding indices reduction (periodontal outcome) and caries increment (new caries lesions, caries outcome). The secondary outcome was change in caries lesions activity (non-cavitated or cavitated lesions). Eligibility criteria Inclusion criteria Randomized clinical trials (RCTs), controlled clinical trials (CCTs), cohort studies and prospective case series (PCS), with at least 6 months of follow-up. Any index related to plaque, gingivitis (or bleeding) indices and caries increment included among the outcome variables studied. Systemically physically and mentally healthy patients. In case of chemical plaque control: test product delivered as a mouthrinse, dentifrice or gel, adjunctively to mechanical oral hygiene (including toothbrushing). Exclusion criteria Additional periodontal mechanical therapy, before or after baseline, excluding professional prophylaxis, supragingival scaling or tooth polishing. Patients wearing orthodontic appliances Chronically medicated with drugs that may affect gingivitis. Patients with untreated periodontitis. Information sources and search The search (Appendix S1) was independently performed (EF, JCC) in two electronic databases [National Library of Medicine (MEDLINE via PubMed) and Cochrane Central Register of Controlled Trials] until May Study selection Titles and abstracts were screened by two independent reviewers (DFN and MGG). Reviewers were calibrated for study screening against another experienced reviewer (EF). Full text of studies of possible relevance was obtained for independent assessment by the same reviewers. Any disagreement was resolved by discussion between reviewers. Data extraction Data were extracted (DFN, MGG) with specially designed data extraction forms. Any disagreement was discussed, and a third reviewer (EF) was consulted when necessary. When the study results were published more than once or were detailed in multiple publications, the most complete data set was identified and included. Quality assessment, risk of bias in individual studies and across studies The quality assessment was carried out by two of the authors (DFN and JCC). Disagreements were solved by discussion until a consensus was reached. In case of RCTs and CCTs, a quality of methods analysis was performed according to Higgins et al. (2011) and Moher et al. (2012); for observational studies, a modification of the Newcastle-Ottawa scale (NOS) was used (Wells et al. 2011, Sanz-Sanchez et al. 2015). A quality of reporting analyses was also performed (Graziani et al. 2012). The publication bias was evaluated using the Egger 0 s linear regression method (Egger & Smith 1998). A sensitivity analysis of the metaanalysis results was performed (Tobias & Campbell 1999). Data analyses Mean values of all outcomes were directly pooled with weighted mean differences (WMDs) and 95% CIs. In the case of plaque and gingival inflammation, due to the high variability of indexes found in the literature, standardized WMDs were calculated (difference in the mean outcome between groups/standard deviation of outcome among

3 S118 Figuero et al. participants). Study-specific estimates were pooled (DerSimonian & Laird 1986), and the random-effect model results were presented. The statistical heterogeneity among studies was assessed using the Q test according to Dersimonian and Laird as well as the I2 index (Higgins et al. 2003). STATA Ò (StataCorp LP, Lakeway Drive, College Station, TX, USA) intercooled software was used to perform all analyses. Statistical significance was defined as a p value <0.05. Strength of the evidence The quality of assessment for each procedure was rated into high, moderate, low and very low level of evidence, according to Needleman et al. (2005). Results Search Figure 1 depicts the study flow chart: 1,373 titles were identified by the electronic search. Once the titles and abstracts were evaluated, 1,280 studies were discarded resulting in 93 studies that were subjected to fulltext analysis. Finally, 32 papers were included. The reasons for exclusion of studies included in the full-text analysis are listed in Appendix S2. Study characteristics Information related to study characteristics is presented in Table 1. Schoolchildren 6 16 years old were the most frequently selected population in the included studies. The sample size at baseline for both test and control groups ranged from 16 to 574 participants. The corresponding values for the final examinations were from 16 to 383 participants. The period of followup for the majority of the studies ranged from 24 to 36 months. Selected indices to assess primary outcomes are presented in Table 2. Risk of bias, quality of design and reporting in individual studies A total of 15 RCTs, 10 CCTs and two PCS were included. The quality assessment of individual RCTs/CCTs and PCs is summarized in tables S1 Fig. 1. Flow diagram. 1 Agreement = 95.89%; kappa = 0.45; 95% CI (0.35; 0.56); p < Agreement = 88.19%; kappa = 0.41; 95% CI (0.19; 0.64); p < Three studies were reported in more than one article: In two papers. (Axelsson et al. 1976, Emilson et al. 1982). In three papers (Horowitz et al. 1976, 1977, Horowitz 1980). In four papers (Lindhe & Axelsson 1973, Axelsson & Lindhe 1974, 1977, Lindhe et al. 1975). and S2, respectively. Quality of design and reporting is presented in Table S3. Descriptive results Interventions (Table 3) were categorized in mechanical (n = 23) and chemical plaque control (n = 4). Fluorides were adjunctive with either mechanical or chemical plaque control interventions. Descriptive results based on type of intervention are presented in Table 4. Mechanical plaque control Professional toothcleaning (PTC). The efficacy of PTC, including flossing, and using 5% monofluorophosphate (MFP) prophylactic paste compared to toothbrushing with 0.2% sodium fluoride (NaF) solution (Lindhe & Axelsson 1973, Axelsson & Lindhe 1974, 1977, Lindhe et al. 1975, Kjaerheim et al. 1980) and to mouthrinse with 0.2% NaF solution (Hamp et al. 1978) was demonstrated in a series of controlled clinical trials carried out in Scandinavian countries. Significant reductions in plaque and gingival scores, concurrently with significantly lower caries increment in the test groups, were observed at the end of the study periods. Similar findings were observed in clinical trials carried out in Germany (Klimek et al. 1985) and in Russia

4 Plaque control in gingivitis and caries S119 Table 1. Study characteristics: follow-up, subgroups, age, sample size and gender, for each comparison, categorized by plaque control regimen: (1A) Efficacy of professional toothcleaning; (1B) frequency of professional toothcleaning; (1C) combined effect of professional tooth cleaning and OHI; (1D) combined effect of professional tooth cleaning and fluorides; (2) motivation and OHI without professionally tooth cleaning; (3A) manual vs powered toothbrushes; (3B) toothbrushing with/without fluoride; (4) chemical plaque control Regimen Reference Country Setting Centres Follow-up (in months) Reason for (sub)group Age (in years) n Control n Test Gender (n Female) Age Range (sub)groups Final Final Overall Control Test Mechanical plaque control 1A Lindhe & Axelsson (1973); Axelsson & Lindhe (1974); Lindhe et al. (1975); Axelsson & Lindhe (1977) Sweden University 1 12, 24, 36, 48 Age NR NR NR NR NR NR NR NR NR 1A Hamp et al. (1978) Sweden University 1 12, 24, 36 Grade 10 (3rd grade) (4th grade) A Kjaerheim et al. Norway University 2 12, 24 Grade 7 14 (All grades) NR NR NR (1980) 7 8 (1st grade) NR NR NR (4th grade) NR NR NR (7th grade) NR NR NR 1A Ashley & England University 2 12, 24, 36 None NR 102 NR Sainsbury (1981) 1A Klimek et al. (1985) Germany University 2 24 None A Petersen (1989) Denmark Private practice 1 12, 24 None NA NA NA NA 58 1A Ekstrand et al. Russia University 2 12, 30 Age All NR NR NR (2000) NR NR NR NR NR NR NR NR NR 1A Chambrone & Chambrone (2011) 1B Hamp & Johansson (1982) Brazil Private practice None NA NA NA NA 16 Sweden Public Health Service 1B Hamp et al. (1984) Sweden Public Health Service 1C Horowitz et al. (1976, 1977), Horowitz (1980) 1C Axelsson & Lindhe (1981) 1D Axelsson & Lindhe (1975) 1D Zickert et al. (1982) USA Public Health Service 1 12, 24, 36 Treatment NR 20 NR 29 NR NR NR NR 20 NR 32 NR NR NR NR 20 NR 25 NR NR NR 1 12 School NR 29 NR 33 NR NR NR NR 33 NR 37 NR NR NR 1 8, 12, 20, 24, 32 None Sweden University 1 18 None NR 52 NR NR NR NR Sweden University 1 12 None Sweden University 1 12, 24 Treatment NR NR NR NR NR NR NR NR NR

5 S120 Figuero et al. Table 1. (continued) Regimen Reference Country Setting Centres Follow-up (in months) Reason for (sub)group Age (in years) n Control n Test Gender (n Female) Age Range (sub)groups Final Final Overall Control Test 2 Fischman et al. (1977) 2 Melsen & Agerbaek (1980) 2 van Palenstein Helderman et al. (1997) USA University 1 6, 12, 18, 24, 30, 36 Denmark University 1 12, 24 Grade (6 7th grades) Treatment 11 NR NR NR NR NR NR NR NR 83 NR 81 NR NR NR (8th grade) NR 19 NR 19 NR NR NR Tanzania University 2 3, 8, 15, 36 None NR NR NR 2 Zanin et al. (2007) Brazil University 1 3, 6, 9, 12, 15 2 Mbawalla et al. (2013) 2 Angelopoulou et al. (2015) 3A Willershausen & Watermann (2001) 3B Murray & Shaw (1980) 3B Andlaw & Tucker (1975) Tanzania Public Health Service & University Greece Private practice & University None NR NR NR 3 24 None NR , 18 None 10 11, Germany University 1 12, 24, 36 Treatment NR NR United Kingdom University 1 12, 24, 36 Treatment NR NR NR England University 1 12, 24, 36 None NR NR NR Chemical plaque control 4 Lang et al. (1982) Switzerland University 1 3, 6 Treatment NR NR NR Johansen et al. Norway University 1 6, 12, 18, 24 Treatment NR NR NR (1975) NR NR NR 4 Axelsson et al. (1976) Sweden University 1 12, 24 Treatment Emilson et al. Sweden University 1 12 Treatment NR NR NR (1982) NR NR NR NR NR NR NR, not reported; NA, not applied. The second study represents a subpopulation from the oldest study.

6 Plaque control in gingivitis and caries S121 Table 2. Study characteristics: outcome assessment, with the selected indices, sites and teeth assessed, categorized by plaque control regimen: (1A) Efficacy of professional toothcleaning; (1B) frequency of professional toothcleaning; (1C) combined effect of professional tooth cleaning and OHI; (1D) combined effect of professional tooth cleaning and fluorides; (2) motivation and OHI without professionally tooth cleaning; (3A) manual vs powered toothbrushes; (3B) toothbrushing with/without fluoride; (4) chemical plaque control Regimen Reference Plaque index (PI) Gingival/bleeding index (GI) Caries index Acronym Site Teeth Acronym Site Teeth Acronym Teeth Mechanical plaque control 1A Lindhe & Axelsson (1973); Axelsson & Lindhe (1974); Lindhe et al. (1975) and Axelsson & Lindhe (1977) S&L 4 All fully erupted 1A Hamp et al. (1978) % Plaque 4 Index teeth: 16, 12, 11, 21, 22, 26, 36, 32, 31, 41, 42, 46 1A Kjaerheim et al. (1980) VPI 4 Fully erupted incisors and first molars 1A Ashley & Sainsbury (1981) mg Plaque NR All teeth excluding lower incisors L&S NR All fully erupted % IGU 4 Index teeth: 16, 12, 11, 21, 22, 26, 36, 32, 31, 41, 42, 46 GBI 4 Fully erupted incisors and first molars DF-S All DF-S All DMF-S All IGU 3 Ramfjord teeth DF-S All 1A Klimek et al. (1985) S&L NR NR L&S 4 Ramfjord teeth DF-S All 1A Petersen (1989) VPI 1 All teeth present GBI 1 All teeth present DMF-S All 1A Ekstrand et al. (2000) M_VOPI 1 Index teeth: 46 (85), 22 (62), 26 (65) 1A Chambrone & Chambrone (2011) 1B Hamp & Johansson (1982) % Plaque 4 Index teeth: 16, 12, 24, 44, 32, 36 1B Hamp et al. (1984) % Plaque 4 Index teeth: 16, 12, 11, 21, 22, 26, 36, 32, 31, 41, 42, 46 1C Horowitz et al. (1976, 1977), Horowitz (1980) M_L 1 Index teeth: 16 (55), 12 (52), 32 (72), 36 (75) dmf-s/t DMF-S/T Primary teeth Permanent teeth S&L 6 NR L&S 6 NR DMF-T All PHP 2 Index teeth: 16, 11, 26, 36, 31, 46 1C Axelsson & Lindhe (1981) % Plaque 4 All erupted permanent teeth 1D Axelsson & Lindhe (1975) % Plaque 4 All fully erupted 1D Zickert et al. (1982) % Plaque 4 All fully erupted % IGU 4 Index teeth: 16, 12, 24, 44, 32, 36 % IGU 4 Index teeth: 16, 12, 11, 21, 22, 26, 36, 32, 31, 41, 42, 46 DHC 2 Index teeth: 16, 11, 26, 36, 31, 46 %IGU 2,3,4 Canines, incisors, first molars %IGU 4 All fully erupted %IGU 4 All fully erupted DF-S All DF-S All DMF-S DMF-T All M_Grondahl All molars and premolars DF-S All DMF-S All 2 Fischman et al. (1977) K-A NR Ramfjord teeth PDI NR Ramfjord teeth DMF-S All 2 Melsen & Agerbaek (1980) S&L NR NR L&S NR NR DMF-S All 2 van Palenstein Helderman et al. (1997) M_S&L 2 Ramfjord teeth %BOP 2 Ramfjord teeth DMF-T All 2 Zanin et al. (2007) S&L NR All deciduous teeth L&S NR All deciduous teeth dmf-s DMF-S Primary teeth Permanent teeth 2 Mbawalla et al. (2013) OHI-S 1 Index teeth: 16, 11, 26, 36, GBI NR NR D-T All 31, 46 2 Angelopoulou et al. (2015) % Plaque 3 Permanent molars and anterior teeth 3A Willershausen & Watermann (2001) GI_S 3 Permanent molars and anterior teeth DMF-T All API NR NR GI NR NR DMF-T All

7 S122 Figuero et al. Table 2. (continued) Regimen Reference Plaque index (PI) Gingival/bleeding index (GI) Caries index Acronym Site Teeth Acronym Site Teeth Acronym Teeth 3B Murray & Shaw (1980) S&L NR NR L&S NR NR DMF-S All DMF-S DMF-T All L&S 4 Index teeth: 16, 11, 26, 36, 31, 46 3B Andlaw & Tucker (1975) OHI-S 1 Index teeth: 16, 11, 26, 36, 31, 46 L&S 4 All fully erupted DMF-S DMF-T All 4 Johansen et al. (1975) S&L NR NR L&S NR NR NR NR DF-S All Chemical plaque control 4 Lang et al. (1982) S&L 4 All fully erupted %IGU 4 All fully erupted 4 Axelsson et al. (1976) % Plaque 4 All fully erupted DF-S All %IGU 4 All fully erupted 4 Emilson et al. (1982) % Plaque 4 All fully erupted NR, not reported. Plaque indices: OHI-S, Simplified Oral Hygiene Index; % Plaque, percentage number of tooth surfaces with plaque; mg Plaque, dry weight of plaque; S&L, Silness & Lӧe Plaque Index; M_VOPI, Visible Occlusal Plaque indices: OHI-S, Simplified Oral Hygiene Index (Greene & Vermillion 1964); % Plaque, percentage number of tooth surfaces with plaque; mg Plaque, dry weight of plaque; S&L, Silness & Lӧe Plaque Index (Silness & Loe 1964); M_VOPI, Visible Occlusal Plaque Index, modified from (Carvalho et al. 1989); K-A, Kobayashi & Ash Index; PHP, Patient Hygiene Performance Index (Podshadley & Haley 1968); VPI, Visible Plaque Index (Ainamo & Bay 1975); M_S&L, modified from Silness & Lӧe Plaque Index (Loe 1967); API, modified Approximal Plaque Index (Lange et al. 1977) Gingival indices: L&S, Lӧe & Silness Gingival Index (Loe & Silness 1963); GI_S, Simplified Gingival Index (Lindhe 1982); IGU, Inflamed Gingival Units; %IGU, percentage of Inflamed Gingival Units (Axelsson & Lindhe 1975); M_L, Gingival Index, modified from S&L; PDI, Periodontal Disease Index (Ramfjord 1959); DHC, Dental Health Center Gingival Index (Suomi 1969); GBI, Gingival Bleeding Index (Ainamo & Bay 1975); GI, Gingivitis Index (G ulzow et al., 1987). Caries indices: DMF-S, Decayed, Missing and Filled Surfaces; DMF-T, Decayed, Missing and Filled Teeth (Klein et al. 1938); DF-S Decayed and Filled Surfaces (Koch, 1967); M_Grondahl, Modified Caries Index System (Grondahl et al. 1977); dmf-s, decayed, missing and filled deciduous surfaces; dmf-t, decayed, missing and filled deciduous teeth; D-T, decayed teeth. References are presented in Appendix S3. Four and five sites were considered for caries examination of anterior and posterior teeth, respectively. Unless mentioned caries examination was considered as being carried out in all permanent and/or deciduous teeth. The second study represents a subpopulation from the oldest study. Number of sites/tooth. (Ekstrand et al. 2000) in which no interventions were offered to control groups. Moreover, PCS performing PTC and topical fluoride application at regular intervals found significant reduction in plaque and gingival scores and low caries increment in Denmark (Petersen 1989) and in Brazil (Chambrone & Chambrone 2011). Unless otherwise mentioned, dental caries was recorded at cavitation level in all studies included in this review. Two studies about the efficacy of PTC registered non-cavitated caries lesions and their fate during the study periods. In the first, in a test group of 6-year-old children, from 28 active non-cavitated lesions, 15 (53.6%) were inactivated in contrast to none in the control group (Ekstrand et al. 2000). In the second, children and adolescents developed only seven active non-cavitated lesions, which were further inactivated (Chambrone & Chambrone 2011). The benefits of PTC with fluoride-free prophylactic paste, in comparison with oral hygiene instructions (OHI), were tested in a group of English schoolchildren. Significant reductions only in plaque and gingival scores were observed at the end of the intervention period (Ashley & Sainsbury 1981). A group of studies analysed the extent to which outcomes could be influenced by the frequency of PTC with either fluoride or rinse or, alternatively, PTC followed by fluoride varnish application in both test and control groups. The frequencies ranged from once every 2 weeks up to once per year. No substantial differences in plaque and gingival scores or in caries increments were observed when the intervals of PTC increased from once a month to once every 3 months in the test groups (Zickert et al. 1982). PTC performed monthly up to once every 6 months had good effects on plaque and gingival scores in the test groups during a 3-year period. However, caries increment was greater, but not significantly, for a 6-month interval than for monthly prophylaxis sessions (Hamp & Johansson 1982). Also, prophylaxis intervals according to individual needs had a better long-term effect on plaque and gingival scores compared to

8 Plaque control in gingivitis and caries S123 Table 3. Study characteristics: intervention, chemical agent, supervision and follow-up examinations, categorized by plaque control regimen: (1A) Efficacy of professional toothcleaning; (1B) frequency of professional toothcleaning; (1C) combined effect of professional tooth cleaning and OHI; (1D) combined effect of professional tooth cleaning and fluorides; (2) motivation and OHI without professionally tooth cleaning; (3A) manual vs powered toothbrushes; (3B) toothbrushing with/without fluoride; (4) chemical plaque control Regimen Reference Intervention Chemical Agent Frequency Control Test Control Test Control Test 1A Lindhe & Axelsson (1973); Axelsson & Lindhe (1974); Lindhe et al. (1975) and Axelsson & Lindhe (1977) Brushing Plaque Disclosing + Brushing + Flossing + Prophylaxis 1A Hamp et al. (1978) Rinse Plaque Disclosing + Brushing + Flossing + Prophylaxis + Rinse 1A Kjaerheim et al. (1980) Brushing Plaque Disclosing + Brushing + Flossing + Prophylaxis 1A Ashley & Sainsbury (1981) OHI Plaque Disclosing + Brushing + Flossing + Prophylaxis + OHI 1A Klimek et al. (1985) None Plaque Disclosing + Brushing + Flossing + Prophylaxis + Varnish 1A Petersen (1989) NA Prophylaxis + F application + OHE 1A Ekstrand et al. (2000) None Plaque Disclosing + Brushing + Prophylaxis + OHE 1A Chambrone & Chambrone (2011) 1B Hamp & Johansson (1982) NA Plaque Disclosing + Rinse (1st yr); none (2nd and 3rd years) 1B Hamp et al. (1984) Brushing + Flossing + Prophylaxis + Rinse + Varnish 1C Horowitz et al. (1976, 1977), Horowitz (1980) 1C Axelsson & Lindhe (1981) 0.2% NaF solution 0.2% NaF solution 0.2% NaF solution 5% MFP prophylatic paste Prophylatic paste (5% MFP 1st year; 0.22% 2nd and 3rd years) + 0.2% NaF solution 0.8% MFP prophylatic paste None Non F prophylatic paste None Non F prophylatic paste + 5% NaF varnish + NaF (home) Every month Different frequencies (Every month, every 2 months) Every 2 weeks ns Every 3 weeks Every 3 months Every 2 weeks 3 sessions ns Every 2 weeks None Every 2.5 months NA 2% NaF solution NA Every 3 6 months None NaF (1.100 ppm F) Brushing + Prophylaxis application NA Topical fluoride Plaque Disclosing + Brushing + Flossing + Prophylaxis + Rinse Brushing + Flossing + Prophylaxis + Rinse None OHI + Daily Plaque Disclosing + Brushing + Flossing 0.2% NaF solution 5% NaF varnish + Placebo solution Prophylaxis Prophylaxis + OHI 0.1% NaF + 0.4% MFP prophylatic paste Prophylatic paste (5% MFP 1st yr; 0.22% 2nd and 3rd years) % NaF rinse 0.2% NaF solution None Non F 0.1% NaF + 0.4% MFP prophylatic paste None Every 1 6 months NA Every 6 12 months Every 2 weeks Different (1st yr) ns frequencies (every 3 weeks, every month, every 6 months) Biannual ns Every 3 weeks None 11 consecutive days Every 2 weeks Every 2 weeks

9 S124 Figuero et al. Table 3. (continued) Regimen Reference Intervention Chemical Agent Frequency Control Test Control Test Control Test 1D Axelsson & Lindhe (1975) Prophylaxis + F- for home use 1D Zickert et al. (1982) OHI + Prophylaxis + Different fluoride regimes Prophylaxis + Non F- for home use OHI + Prophylaxis + Different fluoride regimes 2 Fischman et al. (1977) OHI G1) OHI + Topical fluorides and Sealants; G2) OHI + Topical fluorides and Sealants + Motivational Program 2 Melsen & Agerbaek (1980) 2 van Palenstein Helderman et al. (1997) 2 Zanin et al. (2007) Supervised brushingin groups + F gel Rinse Rinse + Motivational Program None Supervised brushing + OHE Individual supervised brushing + OHE 2 Mbawalla et al. (2013) None Supervised Brushing + OHE 2 Angelopoulou et al. (2015) 3A Willershausen & Watermann (2001) OHE based ontraditional Lecturing Manual Brushing + OHI OHE based on Experimental Lecturing G1) Manual brushing + OHI; G2) Powered brushing + OHI 5% MFP prophylatic paste G1) non F; G2) MFP; G3) NaF rinses + s Placebo prophylatic paste G1) non F; G2) MFP; G3) NaF rinses + s NR NR Every 3 months Every month NR NR NR ns Every 1 year 0.2 NaF solution 3B Murray & Shaw (1980) Brushing Brushing Placebo (low abrasivity ) 3B Andlaw & Tucker (1975) Brushing Brushing Placebo 0.2 NaF solution Every Day ns NR None NR None Once a week 1,23% APF gel NR Every year Every 3 months None NR None NR None F NR ns NR ns NR NR Once a year Every 3 months 0.8 MFP (G1-low abrasivity; G2-normal abrasivity) MFP (1000 ppm) 4 Lang et al. (1982) Rinse Rinse Placebo G1 and G2) 0.2% CHX; G3) 0.1% CHX NR ns NR ns NR ns NR ns 6x/week G1) 2x/week; G2 and G3) 6x/week

10 Plaque control in gingivitis and caries S125 Table 3. (continued) Regimen Reference Intervention Chemical Agent Frequency Control Test Control Test Control Test Every 6 months ns Every 6 months ns G1) 1% CHX (normal abrasivity); G2) 0.4% CHX (normal abrasivity); G3) 0.4% CHX (no abrasive) 4 Johansen et al. (1975) Brushing Brushing G1) Placebo (normal abrasivity); G2) Placebo (no abrasive) Every 2 weeks Every 2 weeks 0.5% CHX gel + 2% MFP rinse MFP 0.5% CHX gel + Placebo rinse and Chemical plaque control + OHI + Rinse + Toothpaste 4 Axelsson et al. (1976) Chemical plaque control + OHI + Rinse + Toothpaste Every 2 weeks Every 2 weeks NA 2% MFP rinse MFP Prophylaxis + OHI + Rinse + Toothpaste Prophylaxis + OHI + Rinse + Toothpaste None Every 2 weeks None G2) 0.5 CHX gel; G3) 0.5 CHX gel + 2% MFP rinse 4 Emilson et al. (1982) None G1) Prophylaxis; G2) Chemical plaque control; G3) F adjuvant with Chemical Plaque control NR, not reported; G, group; NA, not applied; OHE, oral health education; OHI, oral hygiene instructions; F, fluoride; MFP, sodium monofluorophosphate; NaF, sodium fluoride; CHX, chlorhexidine.. ns Not supervised. Supragingival scaling and tooth polishing. The second study represents a subpopulation from the previous study. fluoride varnish treatment every 6 months (Hamp et al. 1984). Studies examining the effect of PTC with 0.4% MFP and 0.1% NaF prophylactic paste, combined or not with OHI, showed that both interventions reduce plaque and gingival scores, but that only the combination with PTC significantly lowers caries increments (Axelsson & Lindhe 1981). Other studies also obtained lower caries increments, but these were not significant (Horowitz et al. 1976, 1977, Horowitz 1980). In these studies, only plaque and gingival scores were significantly reduced (Horowitz et al. 1976, 1977, Horowitz 1980). Motivational programmes and OHI. Studies examining the combined efficacy of motivational programmes and OHI, which benefited from individualized supervised toothbrushing, showed either significant reduction in plaque and gingival scores and lower caries increment in the test group compared to control (Zanin et al. 2007), or no improvement on these oral health conditions (Mbawalla et al. 2013). Also, no improvement was found when supervised toothbrushing was delivered to a group of children from a low socioeconomic background in Tanzania (van Palenstein Helderman et al. 1997). The addition of topical fluoride application or fluoride rinses had no effect either on plaque or gingival scores, or on caries increment (Fischman et al. 1977, Melsen & Agerbaek 1980). A motivational programme comparing experimental oral hygiene education versus traditional lecturing only improved plaque scores on the first 6 months. However, after 18 months, none of the outcomes differed from the control group (Angelopoulou et al. 2015). Self-performed toothcleaning. A study examining the efficacy of selfperformed toothcleaning with manual and powered toothbrushing failed to show any significant differences in gingival status and caries increments in children (Willershausen & Watermann 2001). Moreover, in studies on the effect of manual toothbrushing with 0.8% MFP versus that of a non-fluoride, the impact

11 S126 Figuero et al. Table 4. Synthesis of the main results for plaque, gingival and caries index, categorized by plaque control regimen: (1A) Efficacy of professional toothcleaning; (1B) frequency of professional toothcleaning; (1C) combined effect of professional tooth cleaning and OHI; (1D) combined effect of professional tooth cleaning and fluorides; (2) motivation and OHI without professionally tooth cleaning; (3A) manual vs powered toothbrushes; (3B) toothbrushing with/without fluoride; (4) chemical plaque control Plaque Index Control Test References Subgroup control Subgroup test Index Final Final Final Final Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mechanical plaque control (1A) Lindhe & Axelsson (1973) (1A) Axelsson & Lindhe (1974) (1A) Lindhe et al. (1975) (1A) Axelsson & Lindhe (1977) (1A) Hamp et al. (1978) (1A) Kjaerheim et al. (1980) (1A) Ashley & Sainsbury (1981) (1A) Klimek et al. (1985) (1A) Petersen (1989) (1A) Ekstrand et al. (2000) (1A) Chambrone & Chambrone (2011) (1B) Hamp & Johansson (1982) (1B) Hamp et al. (1984) (1C) Horowitz et al. (1976) (1C) Horowitz et al. (1977) (1C) Horowitz (1980) Group 1: 7 8 years NR *** NR Group 2: years S&L NR *** NR Group 3: years NR *** NR Group 1: 7 8 years S&L NR *** NR Group 2: years NR *** NR Group 3: years NR *** NR Group 1: 7 8 years NR NR NR NR NR NR*** Group 2: years S&L NR NR NR NR NR NR*** Group 3: years NR NR NR NR NR NR*** Group 1: 7 8 years S&L NR NR NR NR NR NR Group 2: years NR NR NR NR NR NR Group 3: years NR NR NR NR NR NR Group 1: 10 years % Plaque 34.4 (10.51) 35 NR 31.5 (10.53) 13.1*** NR (9.92) Group 2: 11 years 34.3 (9.06) 32.4 NR 30 (10.69) 14.9*** NR (8.37) Grade 1 VPI NR ** NR Grade NR ** NR Grade NR ** NR None mg Plaque 3.23 (1.84) 2.2 (1.32) NR 3.38 (1.96) 1.29*** NR (0.99) None S&L 1.3 (0.5) 1.3 (0.4) NR 1.5 (0.4) 0.5 (0.2) NR None VPI NA NA NA NR Group A: 3 years old M_VOPI NR NR NR NR NR NR*** Group B: 6 years old NR NR NR NR NR NR*** Group C: 11 years old NR NR NR NR NR NR*** Parents with G S&L NA NA NA NR 0.5 (0.3) NR Parents with AgP NA NA NA NR 0.4 (0.2) NR Parents with ChP NA NA NA NR 0.5 (0.3) NR Control Test A % Plaque NR 70.0 NR NR 30.1*** NR Control Test B NR 70.0 NR NR 33.2*** NR Control Test C NR 70.0 NR NR 45.5*** NR Munkhagen school % Plaque 7.9 (10.2) 17.7 (13.4) NR 8.7 (9.2) 14.5 (10.3) NR Osterberga school 25.6 (9.7) 19.3 (10.8) NR 28.7 (10.9) 19.5 (8.0) NR None PHP 3.11 (0.61) 3.36 (0.58) 0.25 (0.88) 3.16 (0.61) 3.22 (0.69) 0.06 NS (0.82) None PHP 3.11 (0.56) 3.26 (0.56) 0.15 (0.56) 3.18 (0.48) 3.21 (0.72) 0.0 NS (0.63) Overall PHP NR NR NR NR NR NR Girls 3.01 (0.76) 2.93 (0.65) 0.08 (0.91) 3.13 (0.77) 2.25 (0.53) 0.88** (0.95) Boys 3.17 (0.61) 3.11 (0.54) 0.06 (0.78) 3.23 (0.77) 2.93 (0.63) 0.30 NS (0.74) (1C) Axelsson No prophylaxis Prophylaxis % Plaque 77 (12.85) 38 (20.71) NR 78 (12.14) 22 (17.14) NR & Lindhe (1981) and no OHI OHI 77 (12.85) 38 (20.71) NR 82 (12.85) 46 (17.85) NR OHI + 77 (12.85) 38 (20.71) NR 81 (12.14) 25 (15) NR prophylaxis (1D) Axelsson Prophylaxis + Prophylaxis + % Plaque 76.4 (11.71) 33.2 (16.6) NR 72.8 (11.38) 28 NS (13.91) NR & Lindhe (1975) F- Non F- (1D) Zickert Non F + prophylaxis Non F % Plaque NR NR et al. (1982) + prophylaxis MFP + MFP + prophylaxis NR NR prophylaxis NaF + prophylaxis NaF + prophylaxis NR NR (49/year) (129/year) (2) Fischman Control Group A K-A NR NR et al. (1977) Control Group B NR NR (2) Melsen & Agerbaek 6 7th grade S&L NR * NR (1980) 8th grade NR NR (2) van Palenstein None M_S&L (0.4) NR NR 20.5 (1.2) NR 4.3 NS (2.5) Helderman et al. (1997) (2) Zanin et al. (2007) None S&L NR * NR (2) Mbawalla et al. None OHI-S 3.3 (2.6) 2.2 (2.5) (2.7) 2 (2.5) 1.30 NS (2013) (2) Angelopoulou et al. None % Plaque NR NS NR (2015) ( ) ( ) ( ) ( ) (3A) Willershausen & Manual Manual API NR NR NR NR NR NR Watermann (2001) Brushing + OHI (1x/yr) Brushing + OHI (4x/yr) Powered brushing + OHI (4x/yr) NR NR NR NR NR NR (3B) Murray & Shaw (1980) Placebo low abrasivity 0.8 MFP low abrasivity 0.8 MFP normal abrasivity S&L (7.27) (6.25) NR 16.2 (7.28) NS (6.13) (7.27) (6.25) NR (7.34) NS (6.53) NR NR

12 Plaque control in gingivitis and caries S127 Gingival Index Caries Index Control Test Control Test Index Final Final Final Final Final Final Final Final Index Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) 0.75 NR NR *** NR 3.2 (0.43) NR NR 4.69 (0.45) NR NR*** L&S 0.74 NR NR *** NR DF-S 6.9 (0.47) NR NR 7.51 (0.44) NR NR*** 0.92 NR NR *** NR 23.6 (2.1) NR NR (2.12) NR NR*** L&S NR *** NR 3.23 (2.9) NR (3.01) NR 0.27*** NR *** NR DF-S 7 (2.2) NR (3.05) NR 0.12*** NR *** NR 24.4 (10.4) NR (11.5) NR 0.17*** NR NR NR NR NR NR*** NR NR 5.75 NR NR 0,33*** L&S NR NR NR NR NR NR*** DF-S NR NR 9.44 NR NR 0,54*** NR NR NR NR NR NR*** NR NR NR NR 0,5*** L&S NR NR NR NR NR NR 3.21 (2.68) NR 7.19 (5.29) 4.44 (3.12) NR 0.43 (0.75) NR NR NR NR NR NR DF-S 7.08 (2.24) NR (11.22) 7.70 (2.7) NR 1.09 (1.55) NR NR NR NR NR NR 22.8 (8.71) NR 15.4 (7.87) (8.87) NR 0.77 (1.08) % IGU 19.6 (10.08) 33.8 (10.68) NR 19.5 (10.09) 10.4*** (11.14) NR DF-S 5.5 (3.42) NR 12.8 (7.43) 6.3 (3.33) NR 5.9*** (5.7) 18.7 (11.19) 31.8 (11.88) NR 20 (11.15) 7.6*** (8.13) NR 7.9 (4.19) NR 12.9 (5.98) 8.6 (5.5) NR 6.8*** (5.42) GBI NR ** NR NR NR 0.51 NR NR 0.22* NR ** NR DMFS NR NR 1.32 NR NR 0.29* NR ** NR NR NR 2.96 NR NR 1.32* IGU 6.43 (3.98) 4.16 (3.48) NR 6.69 (3.74) 3.4*** (2.78) NR DF-S (7.68) NR 4.66 (3.69) (7.04) NR 4.97 NS (4.27) L&S 0.9 (0.4) 1.1 (0.4) NR 1.1 (0.4) 0.5 (0.3) NR DF-S 8.13 (6.6) NR 5.02 (4.2) 8.81 (7.6) NR 2.71*** (2.8) GBI NA NA NA NR DMFS NA NA NA 62.8 NR 69.2 M_L NR NR NR NR NR* NR* dmf-s NR 8,6 (5,90) NR NR 4.91 (3.82) NR*** NR NR NR NR NR*** NR*** DMFS 0.19 (0.57) 2.24 (2.12) NR 0.06 (0.28) 0.28 (0.64) NR*** NR NR NR NR NR** NR** DMFS 2.84 (2.4) 6.35 (5.8) NR 2.4 (1.98) 3.12 (2.9) NR*** L&S NA NA NA NR 0.2 (0.1) NR NA NA NA NR NR 1.1 (1.5) NA NA NA NR 0.3 (0.2) NR DMFT NA NA NA NR NR 0.8 (1.4) NA NA NA NR 0.4 (0.5) NR NA NA NA NR NR 1.2 (1.5) %IGU NR 49.3 NR NR 9.0 NR 25 (10.6) NR 3.3 (4.2) 20 (11.74) NR 1.0* (1.51) NR 49.3 NR NR 13.8 NR DF-S 25 (10.6) NR 3.3 (4.2) 21 (10.35) NR 1.2* (1.41) NR 49.3 NR NR 31.8 NR 25 (10.6) NR 3.3 (4.2) 21.6 (9.9) NR 2.0 NS (2.4) %IGU 7.9 (10.8) 11.9 (12.9) NR 2.7 (3.4) 4 (4.6) NR DF-S 17.9 (11.3) NR 2.3 (3.2) 16.2 (10.3) NR 1.3 (2.3) 15.8 (12.6) 14 (13.8) NR 25.6 (13.4) 15 (11.6) NR 15.1 (8.6) NR 1.6 (2.9) 18.6 (9.7) NR 2.3 (2.4) DHC 1.13 (0.31) 1.11 (0.44) 0.02 (0.58) 1.13 (0.31) 0.99 (0.27) 0.14 NS DMFS 7.53 (7.34) 7.61 (7.44) 2.15 (2.63) 7.89 (7.68) 7.27 (7.40) 2.17 NS (3.43) (0.55) DHC 1.12 (0.28) 0.89 (0.42) (0.36) 0.82 (0.39) 0.32 NS DMFS 7.53 (6.67) (4.03) 7.89 (6) 6.15 (6.12) 2.96 NS (3.96) (0.36) DHC NR NR NR NR NR NR DMFS 5.96 (8.57) NR 4.89 (4.67) 7.88 (9.37) NR 4.27 NS (4.64) 1.09 (0.46) 1.14 (0.26) (0.39) 1.12 (0.46) 0.67 (0.32) 0.45** NR NR NR NR NR NR (0.32) 1.14 (0.31) 1.22 (0.26) (0.26) 1.18 (0.46) 0.97 (0.32) 0.21 NS NR NR NR NR NR NR (0.32) %IGU 48 (29.28) 27 (22.85) NR 47 (29.28) 11 (11.43) NR 3 (3.03) NR 2.6 (3.53) 3 (3.32) NR 0.9 (2.16) 48 (29.28) 27 (22.85) NR 55 (25.71) 35 (23.57) NR M_Grondahl 3 (3.03) NR 2.6 (3.53) 3.3 (3.61) NR 2.5 (3.32) 48 (29.28) 27 (22.85) NR 54 (25.71) 14 (11.43) NR 3 (3.03) NR 2.6 (3.53) 3.5 (3.53) NR 0.6 (1.73) %IGU 24.3 (12.3) 7.4 (6.8) NR 25.2 (35.4) 5.6 (5.7) NR DF-S 13.1 NR 0.26 (0.43) 13.9 NR 0.7 NS (2.2) %IGU NR NR NR NR 7 (6.3) NR NR 5.4 (4.7) NR NR DMFS NR NR 4.2 (4.5) NR NR 3.2 (2.8) NR NR NR NR 3.8 (3.2) NR NR 3.2 (3.2) PDI NR 0.88 NR NR 0.86 NR DMFS NR 8.9 NR NR 7.69 NR NR 0.88 NR NR 0.92 NR NR 8.9 NR NR 7.54 NR L&S NR NS NR DMFS 8.66 (15.56) NR 1.79 (1.96) 8.7 (13.09) NR 2.85 NS (2.91) NR NR (33.38) NR 2.44 (22.23) (28.94) NR 1.83 NS (20.62) %BOP 4.2 (0.3) NR +0.7 (0.2) 4.9 (0.9) NR 0.1 (0.5)* DMFT 0.5 (0.2) 0.9 (0.3) NR 0.4 (0.2) 0.9 (0.3) NR L&S NR * NR dmfs NR NR 23 NR NR 8 NS DMFS GBI 0.4 (0.7) 0.5 (1.1) (0.9) 0.3 (0.6) 0.2*** D-T 1.2 (1.9) 1.7 (2.2) (1.5) 1.7 (2.2) 0.7 NS GI_S 34.4 ( ) 26 ( ) NR 31.2 ( ) 22.2 NS ( ) NR DMFT 0.55 (1.16) 0.87 (1.3) NR 0.77 (1.13) 1.0 NS (1.45) NR GI NR NR NR NR NR NR DMFT NR NR NR NR NR NR NR NR NR NR L&S (4.53) (4.83) NR (5.20) NS (4.67) NR DMFS NR 6.43 (6.02) 9.57 NR 4.22*** (5.01) (4.53) (4.83) NR (4.96) NS (4.78) NR NR 6.43 (6.02) 9.91 NR 4.72** (5.47)

13 S128 Table 4. Figuero et al. (Continued) Plaque Index Control Test References Subgroup control Subgroup test Index Final Final Final Final Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) (3B) Andlaw & Tucker Placebo (1975) Chemical plaque control (4) Lang et al. (1982) Placebo rinse 6x/week MFP OHI-S 0.85 (0.39) 0.89 (0.53) NR 0.84 (0.4) 0.90 NS (0.5) NR 0.2% CHX S&L 1.54 (0.33) 1.53 NR 1.48 (0.33) 1.24* NR rinse 6x/week 0.2% CHX 1.54 (0.33) 1.53 NR 1.34 (0.43) 1.34* NR rinse 2x/week 0.1% CHX 1.54 (0.33) 1.53 NR 1.48 (0.33) 1.29* NR rinse 6x/week (4) Johansen Placebo Placebo S&L NR NS NR et al. (1975) (no abrasive) + abrasive 0.4% CHX NR NS NR + abrasive 1% CHX NR NS NR abrasive (4) Axelsson CHX + CHX + OHI + % Plaque 67.2 (13.9) 22.4 (14.6) NR 60.9 (13.1) 22.9 (15.6) NR et al. (1976) OHI + MFP Placebo CHX + Prophylaxis (13.9) 22.4 (14.6) NR 69 (11.4) 23.3 (13.8) NR OHI + MFP OHI + MFP CHX + Prophylaxis (13.9) 22.4 (14.6) NR 67.9 (10.6) 35.3 (13.6) NR OHI + MFP OHI + Placebo CHX + Prophylaxis (13.1) 22.9 (15.6) NR 69 (11.4) 23.3 (13.8) NR OHI + Placebo OHI + MFP CHX + Prophylaxis (13.1) 22.9 NR 67.9 (10.6) 35.3 (13.6) NR OHI + Placebo OHI + Placebo Prophylaxis + Prophylaxis + 69 (11.4) 23.3 NR 67.9 (10.6) 35.3 (13.6) NR OHI + MFP OHI + Placebo (4) Emilson Control Prophylaxis % Plaque 73.1 (16) 67.2 (18) NR 75.9 (10.4) 26.3*** (13.9) NR et al. (1982) CHX gel 73.1 (16) 67.2 (18) NR 71.8 (8.9) 74.3 NS (11.9) NR CHX gel + MFP rinse 73.1 (16) 67.2 (18) NR 69.8 (19.6) 70 NS (16.4) NR NR, not reported; NA, not applied. Plaque indices: OHI-S, Simplified Oral Hygiene Index (Greene & Vermillion 1964); % Plaque, percentage number of tooth surfaces with plaque; mg Plaque, dry weight of plaque; S&L, Silness & Lӧe Plaque Index (Silness & Loe 1964); M_VOPI, Visible Occlusal Plaque Index, modified from (Carvalho et al. 1989); K-A, Kobayashi & Ash Index; PHP, Patient Hygiene Performance Index (Podshadley & Haley 1968); VPI, Visible Plaque Index (Ainamo & Bay 1975); M_S&L, modified from Silness & Lӧe Plaque Index (Loe 1967); API, modified Approximal Plaque Index (Lange et al. 1977). Gingival indices: L&S, Lӧe & Silness Gingival Index (Loe & Silness 1963); GI_S, Simplified Gingival Index (Lindhe et al.1982); IGU, Inflamed Gingival Units; %IGU, percentage of Inflamed Gingival Units (Axelsson & Lindhe 1975); M_L, Gingival Index, modified from S&L; PDI, Periodontal Disease Index (Ramfjord 1959); DHC, Dental Health Center Gingival Index (Suomi 1969); GBI, Gingival Bleeding Index (Ainamo & Bay 1975); GI, Gingivitis Index (G ulzow et al., 1987). Caries indices: DMF-S, Decayed, Missing and Filled Surfaces; DMF-T, Decayed, Missing and Filled Teeth (Klein et al. 1938); DF-S Decayed and Filled Surfaces (Koch, 1967); M_Grondahl, Modified Caries Index System (Grondahl et al. 1977); dmf-s, decayed, missing and filled deciduous surfaces; dmf-t, decayed, missing and filled deciduous teeth; D-T, Decayed Teeth. Four and five sites were considered for caries examination of anterior and posterior teeth, respectively. Unless mentioned caries examination was considered as being carried out in all permanent and/or deciduous teeth. Results are presented as median and interquartile range. The second study represents a subpopulation from the oldest study; G, gingivitis; AgP, aggressive periodontitis; ChP, chronic periodontitis. Statistical significant differences between control and test groups are presented as * (p < 0.05); ** (p < 0.01) and *** (p < 0.001); NS, non-significant difference. was the same on plaque and gingival scores, but significantly higher for the fluoride intervention regarding reduction in caries increment (Murray & Shaw 1980), while contradictory results for plaque and gingival scores were registered in the study by Andlaw & Tucker (1975). Chemical plaque control The use of mouthrinses with 0.1% or 0.2%, chlorhexidine (CHX) in children, for 6 months, achieved significant reductions for plaque and gingival indices, and no differences for caries increment, compared with a placebo (Lang et al. 1982). With the concurrent application of PTC and a 0.4% or 1% CHX in dental students over a 2-year period, no differences were found in plaque and gingival scores, with the placebo group, while a lower caries increment was observed in the 1% CHX group, when compared to all other groups, concomitantly with a higher number of active non-cavitated lesions becoming inactive (Johansen et al. 1975). The combination of a 0.5% CHX gel, rinsing with 2% MFP solution or 0.8% MFP, failed to significantly reduce plaque accumulation and gingival scores and to reduce the rate of caries development (Axelsson et al. 1976, Emilson et al. 1982). Meta-analyses Regarding the efficacy of OHI and PTC, the standardized WMDs revealed a reduction in plaque levels favouring OHI and PTC [n = 4; WMD = 1.294; 95% CI (0.445; 2.144); p = 0.003] (Table 5). In terms of gingivitis levels, OHI and PTC resulted in statistically significant higher reductions in standardized gingival index [n = 4; WMD = 1.728; 95% CI (0.631; 2.825); p = 0.002].

14 Plaque control in gingivitis and caries S129 Gingival Index Caries Index Control Test Control Test Index Final Final Final Final Final Final Final Final Index Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) L&S 0.10 (0.11) 0.11 (0.14) NR 0.10 (0.11) 0.11 NS (0.14) NR DMFS 9.7 (7.55) NR 8.81 (5.72) 9.18 (6.48) NR 7.14*** (5.72) L&S 0.96 (0.44) 0.74 NR 0.88 (0.43) 0.15** NR 8.03 (6.51) NR (6.0) NR 0.93 NS 0.96 (0.44) 0.74 NR 0.78 (0.35) 0.38* NR DMFS 8.03 (6.51) NR (6.82) NR 0.71 NS 0.96 (0.44) 0.74 NR 0.80 (0.37) 0.25** NR 8.03 (6.51) NR (5.96) NR 0.89 NS L&S NR NS NR NR NR NR NR NR NS NR NR NR NR NR NS NR NR NR %IGU 22.4 (15.2) 3.2 (4.8) NR 18.4 (12.4) 3.5 (3.1) NR DF-S 14.2 (7.6) NR 5.9 (5.5) 13.2 (7.8) NR 4.3 NS (5.0) 22.4 (15.2) 3.2 (4.8) NR 22.5 (11.4) 4.1 (4.2) NR 14.2 (7.6) NR 5.9 (5.5) 13.1 (7.6) NR 0.3*** (0.6) 22.4 (15.2) 3.2 (4.8) NR 23.5 (11.2) 6.4 (4.7) NR 14.2 (7.6) NR 5.9 (5.5) 12.8 (7.7) NR 0.4*** (1.2) 18.4 (12.4) 3.5 (3.1) NR 22.5 (11.4) 4.1 (4.2) NR 13.2 (7.8) NR 4.3 (5.0) 13.1 (7.6) NR 0.3*** (0.6) 18.4 (12.4) 3.5 (3.1) NR 23.5 (11.2) 6.4 (4.7) NR 13.2 (7.8) NR 4.3 (5.0) 12.8 (7.7) NR 0.4*** (1.2) 22.5 (11.4) 4.1 (4.2) NR 23.5 (11.2) 6.4 (4.7) NR 13.1 (7.6) NR 0.3 (0.6) 12.8 (7.7) NR 0.4*** (1.2) %IGU 29.3 (17.2) 33.3 (19.2) NR 30.4 (14.7) 7.1*** (8.9) NR DF-S 23.6 (10.8) NR 10.1 (8) 19.1 (9.68) NR 1.3*** (3.49) 29.3 (17.2) 33.3 (19.2) NR 25.5 (13.8) 24.8 NS (14.9) NR 23.6 (10.8) NR 10.1 (8) 18.9 (8.61) NR 5.7 NS (5.24) 29.3 (17.2) 33.3 (19.2) NR 31.1 (20.4) 35.9 NS (25.2) NR 23.6 (10.8) NR 10.1 (8) 19.3 (9.2) NR 8.4 NS (8) The meta-analysis on the efficacy of fluorides on caries management showed statistically significant lower caries increment favouring the test group [n = 5; WMD = 1.159; 95% CI (0.145; 2.172); p = 0.025] and a lack of statistically significant effect on plaque [n = 4; WMD = 0.145; 95% CI ( 0.142; 0.433); p = 0.323] or gingival scores [n = 4; WMD = 0.018; 95% CI ( 0.079; 0.116); p = 0.715]. Risk of bias across studies There was no evidence of publication bias among the studies for the main common outcome (standardized plaque) [t = 0.16; 95% CI ( 14.18; 12.37); p = 0.879], and the sensitivity analyses for this outcome showed that the exclusion of a single study did not substantially alter any estimate. Strength of the evidence Information reporting the strength of the evidence for each intervention on each outcome is presented in Table 6. As a general trend, the strength of the evidence ranges between low and moderate. Discussion The present systematic review analysed the effect of mechanical and chemical plaque control procedures in the simultaneous management of periodontal diseases and caries. The primary outcomes were reduction in plaque and gingival scores and the mean caries increment. Low to moderate evidence is available to support that combined professional and self-performed mechanical plaque control significantly reduce plaque and gingivitis scores during the intervention period. Also, there is moderate evidence on the efficacy of

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